<!DOCTYPE html>
<html>
    <body>
       
        <canvas id="myCanvas" width="200" height="100"
        style="border:1px solid red;">
        Your browser does not support the canvas element.
        </canvas>   
        <script type="text/javascript">
        var c=document.getElementById("myCanvas");
        var cxt=c.getContext("2d");
        cxt.moveTo(10,10);
        cxt.lineTo(150,50);
        cxt.lineTo(10,50); 
        cxt.stroke();
        
        </script>
    </body>
</html>